引用

如何在.net动态网站中实现RSS呢？主要思想是编写一个能够自动按照RSS格式生成xml文档的通用类。具体步骤如下：

步骤一：创建RSS通用类

C#代码

using System;  

using System.IO;  

using System.Data;  

using System.Xml;  

using System.Collections.Generic;  

using System.Text;  

public class Rss {  

public Stream OutputStream;  

public string RssTitle;  

public string PublisherUrl;  

public string Description;  

public string Copyright;  

public string Generator;  

public DataSet ItemSource;  

public string ItemTitleField;  

public string ItemUrlField;  

public string ItemDescriptionField;  

public string ItemPublicationDateField;  

public string ItemAuthor;  

public static void PublishRss(Rss r){  

//创建了 System.Xml.XmlTextWriter类的实例,这个类是撰写XML文档的快速方式  

XmlTextWriter writer = new XmlTextWriter(r.OutputStream,  Encoding.UTF8);

 

//这个方法写入XML 1.0版本的声明,即

version="1.0" encoding="utf-8"?>  

writer.WriteStartDocument();  

//WriteStartElement这个方法写入指定标签的起始标记。  

writer.WriteStartElement("rss");  

//这个方法为当前打开的标签写入属性。  

writer.WriteAttributeString("version", "2.0");  

writer.WriteStartElement("channel");  

//这个方法写入一个起始标记和一个结束标记  

writer.WriteElementString("title", r.RssTitle);  

writer.WriteElementString("link", r.PublisherUrl);  

writer.WriteElementString("description", r.Description);  

writer.WriteElementString("copyright", r.Copyright);  

writer.WriteElementString("generator", r.Generator);  

foreach (DataRow row in r.ItemSource.Tables[0].Rows) {  

writer.WriteStartElement("item");  

writer.WriteElementString("author", row[r.ItemAuthor].ToString());

 

writer.WriteElementString("title", row[r.ItemTitleField].ToString());

 

writer.WriteElementString("link", row[r.ItemUrlField].ToString());

 

writer.WriteElementString("description", row[r.ItemDescriptionField].ToString());

 

writer.WriteElementString("pubDate",

Convert.ToDateTime(row[r.ItemPublicationDateField]).ToString("dd MMM yyyy

hh:mm:00 "));  

writer.WriteEndElement();  

}  

//写入channel标记的结束标记  

writer.WriteEndElement();  

//写入RSS标记的结束标记  

writer.WriteEndElement();  

//将所有缓存的output到目的位置  

writer.Flush();  

}  

}  

using System;

using System.IO;

using System.Data;

using System.Xml;

using System.Collections.Generic;

using System.Text;

public class Rss {

public Stream OutputStream;

public string RssTitle;

public string PublisherUrl;

public string Description;

public string Copyright;

public string Generator;

public DataSet ItemSource;

public string ItemTitleField;

public string ItemUrlField;

public string ItemDescriptionField;

public string ItemPublicationDateField;

public string ItemAuthor;

public static void PublishRss(Rss r){

//创建了 System.Xml.XmlTextWriter类的实例,这个类是撰写XML文档的快速方式

XmlTextWriter writer = new XmlTextWriter(r.OutputStream,  Encoding.UTF8);

//这个方法写入XML 1.0版本的声明,即

encoding="utf-8"?>

writer.WriteStartDocument();

//WriteStartElement这个方法写入指定标签的起始标记。

writer.WriteStartElement("rss");

//这个方法为当前打开的标签写入属性。

writer.WriteAttributeString("version", "2.0");

writer.WriteStartElement("channel");

//这个方法写入一个起始标记和一个结束标记

writer.WriteElementString("title", r.RssTitle);

writer.WriteElementString("link", r.PublisherUrl);

writer.WriteElementString("description", r.Description);

writer.WriteElementString("copyright", r.Copyright);

writer.WriteElementString("generator", r.Generator);

foreach (DataRow row in r.ItemSource.Tables[0].Rows) {

writer.WriteStartElement("item");

writer.WriteElementString("author", row[r.ItemAuthor].ToString());

writer.WriteElementString("title", row[r.ItemTitleField].ToString());

writer.WriteElementString("link", row[r.ItemUrlField].ToString());

writer.WriteElementString("description",

row[r.ItemDescriptionField].ToString());

writer.WriteElementString("pubDate",

Convert.ToDateTime(row[r.ItemPublicationDateField]).ToString("dd MMM yyyy

hh:mm:00 "));

writer.WriteEndElement();

}

//写入channel标记的结束标记

writer.WriteEndElement();

//写入RSS标记的结束标记

writer.WriteEndElement();

//将所有缓存的output到目的位置

writer.Flush();

}

}

Note:这里pubDate的日期格式很重要，当你按上面的代码对pubDate进行格式转换的时候， 假如数据库中是 2007-9-14 9:58，那么在英文操作系统下，会转换成 “14 Sep 2007 9:58”, 这个是没有问题的。但在中文操作系统下，就变成了 “14 九月 2007 9:58”。导致的结果就是在IE7中点开rss源的 时候，发现日期没有显示。如果你不进行数据格式转换，简单的使用一个 ToString()，结果仍是如此。这里写了一个格式转换代码：

C#代码

public static string GetRssDate(Object date) {  

DateTime rssDate = Convert.ToDateTime(date);  

string[] monthName = { "Jan", "Feb", "Mar",

"Apr", "May", "Jun", "Jul",

"Aug", "Sep", "Oct", "Nov",

"Dec" };  

StringBuilder sb = new StringBuilder();  

sb.Append(rssDate.Day);  

sb.Append(" ");  

sb.Append(monthName[Convert.ToInt32(rssDate.Month) - 1]);  

sb.Append(" ");  

sb.Append(rssDate.Year);  

sb.Append(" ");  

sb.Append(rssDate.ToLongTimeString());  

return sb.ToString();  

}  

public static string GetRssDate(Object date) {

DateTime rssDate = Convert.ToDateTime(date);

string[] monthName = { "Jan", "Feb", "Mar",

"Apr", "May", "Jun", "Jul",

"Aug", "Sep", "Oct", "Nov",

"Dec" };

StringBuilder sb = new StringBuilder();

sb.Append(rssDate.Day);

sb.Append(" ");

sb.Append(monthName[Convert.ToInt32(rssDate.Month) - 1]);

sb.Append(" ");

sb.Append(rssDate.Year);

sb.Append(" ");

sb.Append(rssDate.ToLongTimeString());

return sb.ToString();

}

步骤二：创建web窗体（RSS.aspx)

1.在RSS.aspx中删出除第一行外的所有代码

2.在RSS.aspx中实例化RSS类

C#代码

protected void Page_Load(object sender, EventArgs e){  

//GetDataSet从数据库筛选出RSS源所需的相关内容如：aritcle,Url,description,pubDate.  

DataSet ds = GetDataSet();  

Rss rss = new Rss();  

rss.OutputStream = Response.OutputStream;  

rss.RssTitle = "DotNetBips.com Latest Articles";  

rss.PublisherUrl = Request.Url.Host;  

rss.Description = "DotNetBips.com - Applying .NET";  

rss.Copyright = "Copyright (C) DotNetBips.com.";  

rss.Generator = "DotNetBips.com RSS Generator";  

rss.ItemSource = ds;  

rss.ItemTitleField = "Title";  

rss.ItemDescriptionField = "Description";  

rss.ItemPublicationDateField = "Pubdate";  

rss.ItemUrlField = "Url";  

rss.ItemAuthor = "Author";  

Response.ContentEncoding = System.Text.Encoding.UTF8;  

Response.ContentType = "text/xml";  

//调用Rss类中的静态方法  

Rss.PublishRss(rss);  

Response.End();  

}  

protected void Page_Load(object sender, EventArgs e){

//GetDataSet从数据库筛选出RSS源所需的相关内容如：aritcle,Url,description,pubDate.

DataSet ds = GetDataSet();

Rss rss = new Rss();

rss.OutputStream = Response.OutputStream;

rss.RssTitle = "DotNetBips.com Latest Articles";

rss.PublisherUrl = Request.Url.Host;

rss.Description = "DotNetBips.com - Applying .NET";

rss.Copyright = "Copyright (C) DotNetBips.com.";

rss.Generator = "DotNetBips.com RSS Generator";

rss.ItemSource = ds;

rss.ItemTitleField = "Title";

rss.ItemDescriptionField = "Description";

rss.ItemPublicationDateField = "Pubdate";

rss.ItemUrlField = "Url";

rss.ItemAuthor = "Author";

Response.ContentEncoding = System.Text.Encoding.UTF8;

Response.ContentType = "text/xml";

//调用Rss类中的静态方法

Rss.PublishRss(rss);

Response.End();

}

步骤三：链接RSS.aspx

在如上两步操作后，RSS的实现已经完成了99%,剩下的就是在需要放置RSS源的页面中（如default.aspx)放置如下代码：

C#代码

1.

title="Your Web Site’s RSS Feed Title " href="rss.aspx"

/> 

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